GPT-6 Luna

OpenAI · GPT Luna line · lightweight

Released September 22, 2026Latest in the line

What changed

Half the input price and 58% less on output than GPT-5.6 Luna, with the same all-round score.

Compared with GPT-5.6 Luna · the model it replaces

Solves two in three hard coding tasks

DeepSWE 1.1 — fixing real bugs in real software projects

66.6%

no GPT-5.6 Luna score published to compare

Same all-round score as the model it replaces

Artificial Analysis Intelligence Index — average of 10 hard tests

37

same as GPT-5.6 Luna

Costs about half as much as the model it replaces

Price per 1M tokens — what developers pay, input / output

$0.10 / $0.50

down from $0.20 / $1.20 · output 58% cheaper

Where the GPT Luna line stands

GPT-6 Luna is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.

GPT-6 Luna

OpenAI · GPT Luna line · lightweight
Just releasedreleased 1 day ago — usual gap is ~95
Released Sep 22, 2026 · what changed →
Days since last release
GPT-6 Luna · Sep 22, 2026
1
days
Usual gap
95
days
Recent gaps
GPT-6 Luna · Sep 2026
75
GPT-5.6 Luna · Jul 2026
114

Every GPT Luna release

Newest first. See the full line with every card →

  1. Sep 22, 2026GPT-6 Luna · this page
  2. Jul 9, 2026GPT-5.6 Luna
  3. Mar 17, 2026GPT-5.4 nano

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